data-mm-id=”_pwzvln0l8″>For a former Super Bowl winning coach, Mike Tomlin came into the 2019 NFL season with plenty to prove. Well, he's done just that, authoring his finest coaching performance for the Steelers, which is saying something because, again, he's won one Super Bowl and appeared in another. Remarkably, after starting the year 0-3, after losing their starting quarterback in Week 2 and having two unproven quarterbacks rotate in and out since, after losing their Pro Bowl running back James Conner for most of the season because of the injury, the Steelers are now 7-5 and in position to make the playoffs. Even more remarkably, they've done it by completely changing their identity, something Tomlin has to get full credit for. Previous to this year, they were a pas…